Scotland's Russell has helped his side to an unprecedented two opening wins in the Six Nations, against England and Wales, with three try assists.
Ntamack was impressive for France in the victory against Italy but failed to hit his straps in the loss at world number one side Ireland two weeks ago.
"There is going to be two magnificent players facing each other," Galthie told reporters on Thursday.
"Sunday we'll see the best in rugby.
"A sold-out stadium, music, the sound, pyrotechnics, we're not going to be bored at the Stade France.
"It will be a spectacle," he added.
Russell plays his club rugby for Racing 92, based less than 15km to the west of the Stade de France.
Ntamack has been a pivotal part of Toulouse's recent return to form which has included two Top 14 titles and a European Champions Cup success.
"Russell will try and contribute, with his style of play and the confidence he has in himself at the moment," Galthie said.
"I think Romain will also bring his know-how, potential and motivation," he added.
France's defeat in Dublin on February 11 was their first test loss in 14 games, a run stretching back to July 2021.
It left Ireland and Gregor Townsend's Scotland as the only two sides who can still win a Grand Slam this season.
"We fell, but we have to get back on our feet," Galthie said.
"What's interesting with the defeat, was to live it, analyse it, understand and look for the keys to be better.
"The keys to be better are to lift our rugby level. Physically, technically and strategically.
"It's not one point on its own that will make us improve. It is the three simultaneously which will allow us to win games like that," he added.
Getting the crowd jumping
Townsend has made just one change to his team for the trip to the French capital, where they will also face Ireland in the Rugby World Cup pool stage on October 7th.
Flanker Hamish Watson (31) returns from concussion as Scotland eye just a second win at the 80,000-capacity Stade de France since winning the Five Nations in 1999.
"It's one of the best arenas with one of the best atmospheres you can play in," Townsend said on Thursday.
"They play a rugby that can get the crowd off their feet. I'd like to think we can do that too. We’ll have a few thousand supporters but it's going to be a tough place to play.
"It's an exciting place to go out and express ourselves," he added.
Galthie has been forced into starting tight-head prop Mohamed Haouas (28) with Uini Atonio (32) suspended and 2021 World Rugby player of the year Antoine Dupont (26) will captain the side at scrum-half.
Dupont may have looked off-form but Galthie's men still lead the competition for off-loads and tackles broken.
"They've got some of the best players in the world and the biggest depth of any nation currently," said Townsend, who played for Castres and Montpellier during his career.
"They play a game where their defence and set piece are massive but there's a real intent to play when they do get the ball - sometimes off counter-attack, sometimes turnover ball.
"We're going to have to be at our best to get a win this weekend."
Follow all the action from France versus Scotland on Flashscore.
